linux-kernel - [PATCH] mmc : export hw reset function info to user

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Message-Id: <1316359225-2224-1-git-send-email-linkinjeon@gmail.com>
Date:	Mon, 19 Sep 2011 00:20:25 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	cjb@...top.org, linux-mmc@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Namjae Jeon <linkinjeon@...il.com>
Subject: [PATCH] mmc : export hw reset function info to user

user app should know whether hw reset function is enable to use it.
so I try to add sysfs file of hw reset function like enhanced area.

Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
---
 drivers/mmc/core/mmc.c   |    6 ++++++
 include/linux/mmc/card.h |    1 +
 include/linux/mmc/mmc.h  |    1 +
 3 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 10f5a19..06c3ffc 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -355,6 +355,10 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 	card->ext_csd.raw_trim_mult =
 		ext_csd[EXT_CSD_TRIM_MULT];
 	if (card->ext_csd.rev >= 4) {
+		/* HW reset function feature support.
+		/* user can know it is enable through sysfs interface.
+		card->ext_csd.raw_hw_reset_function =
+			ext_csd[EXT_CSD_RST_FUNCTION];
 		/*
 		 * Enhanced area feature support -- check whether the eMMC
 		 * card has the Enhanced area enabled.  If so, export enhanced
@@ -499,6 +503,7 @@ MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 		card->ext_csd.enhanced_area_offset);
 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
+MMC_DEV_ATTR(raw_hw_reset_function, "0x%02x\n", card->ext_csd.raw_hw_reset_function);
 
 static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_cid.attr,
@@ -514,6 +519,7 @@ static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_serial.attr,
 	&dev_attr_enhanced_area_offset.attr,
 	&dev_attr_enhanced_area_size.attr,
+	&dev_attr_raw_hw_reset_function.attr,
 	NULL,
 };
 
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index b460fc2..237bceb 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -65,6 +65,7 @@ struct mmc_ext_csd {
 	unsigned int		enhanced_area_size;	/* Units: KB */
 	unsigned int		boot_size;		/* in bytes */
 	u8			raw_partition_support;	/* 160 */
+	u8                      raw_hw_reset_function;  /* 162 */
 	u8			raw_erased_mem_count;	/* 181 */
 	u8			raw_ext_csd_structure;	/* 194 */
 	u8			raw_card_type;		/* 196 */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 5a794cb..233c932 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -272,6 +272,7 @@ struct _mmc_csd {
 
 #define EXT_CSD_PARTITION_ATTRIBUTE	156	/* R/W */
 #define EXT_CSD_PARTITION_SUPPORT	160	/* RO */
+#define EXT_CSD_RST_FUNCTION           162     /* R/W */
 #define EXT_CSD_WR_REL_PARAM		166	/* RO */
 #define EXT_CSD_ERASE_GROUP_DEF		175	/* R/W */
 #define EXT_CSD_PART_CONFIG		179	/* R/W */
-- 
1.7.4.4

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